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Finding the Fourth Proportional to 1,123, 1,685.22 and 439

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Solution

The fourth proportional to 1,123, 1,685.22 and 439 is: 658.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123 : 1,685.22 = 439 : x
  2. Step 2: Convert to fraction form
    1,123/1,685.22 = 439/x
  3. Step 3: Cross multiply
    1,123x = 1,685.22 × 439
  4. Step 4: Simplify right side
    1,123x = 739,811.58
  5. Step 5: Solve for x
    x = 739,811.58/1,123
  6. Step 6: Final answer
    x = 658.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.